#include <iostream>

using namespace std;

int main() {
/*
    int a = 5;
    cout << "a++ = " << a++ << ", a = " << a << endl;

    int b = 5;
    cout << "++b = " << ++b << ", b = " << b << endl;
*/
/*
    // bool a = true;
    bool a = -1234;
    bool b = false;

    cout << "a = " << a << endl;
    cout << "b = " << b << endl;
*/


/*
    if(1) {
        cout << "HAHAHAHAH" << endl;
        cout << "66666666666" << endl;
    } else
        cout << "HEIHEIHEIHEI" << endl;
*/

/*
    // 判断一个数 n 是不是在 70 -- 80 之间
    int n;
    cin >> n;
    if(70 <= n <= 80) {
        cout << "Yes" << endl;
    } else {
        cout << "No" << endl;
    }
*/

    char s;

    cin >> s;

    if(s >= '0' && s <= '9') {
        cout << (s - '0') * 5 << endl;
    } else {
        cout << "No" << endl;
    }


    return 0;
}
